面板加入背景图,及自定义组件位置，提示框应用

客官°小女子只卖身不卖艺 2022-05-19 01:13 104阅读 0赞

Icon img=new ImageIcon("D:\\\\lll\\\\aaa.jpg");

JPanel jp=new JPanel();  //面板jp  
           JPanel  jp2=new JPanel(); //创建面板jp2。   
           JLabel j3=new JLabel(img);

package dierzhou;
    
    import java.awt.Button;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.io.ObjectInputStream.GetField;
    
    import javax.swing.Icon;
    import javax.swing.ImageIcon;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JOptionPane;
    import javax.swing.JPanel;
    import javax.swing.JPasswordField;
    import javax.swing.JTextField;
    import javax.swing.text.Document;
    
    
    class Listen implements ActionListener{ //ActionListener用来响应用户点击按钮
      private static JFrame frame;
    	public void actionPerformed(ActionEvent e) {  //定义处理事件的方法
    		// TODO Auto-generated method stub
    		String name=e.getActionCommand();//返回与此动作相关的命令字符串
    		if(name.equals("登录")){
    		JOptionPane.showMessageDialog(frame, "登录失败","提示",JOptionPane.ERROR_MESSAGE);
    	} else if(name.equals("退出")){
    		JOptionPane.showMessageDialog(frame, "确定要退出吗","提示",JOptionPane.INFORMATION_MESSAGE);
    		System.exit(0); //退出
    	}
    }
    }
    public  class text1 extends Listen {
    	 public static void main(String[] args) {
               JFrame jf=new JFrame("java");
               JLabel j1=new JLabel("账号");
               JTextField t1=new JTextField();
               JLabel j2=new JLabel("密码");
               JPasswordField t2=new JPasswordField(); 
               JButton b1 =new JButton("登录");
               JButton b2 =new JButton("退出");
               Icon img=new ImageIcon("D:\\lll\\aaa.jpg");
               JPanel jp=new JPanel();  //面板jp
               JPanel  jp2=new JPanel(); //创建面板jp2。 
               JLabel j3=new JLabel(img);
               jp.setLayout(null);//清空布局管理器 后 setbounds设置的值才可以实效
               j3.setBounds(0, 0,280, 400);  //x,y,width,height
               j1.setBounds(70, 30, 50, 30);
               t1.setBounds(130, 30, 110, 30);
               j2.setBounds(70, 80, 50, 30);
               t2.setBounds(130, 80, 110, 30);
               b1.setBounds(40, 150, 80, 30);
               b2.setBounds(190, 150, 80, 30);
               jp.add(j1);
               jp.add(t1);
               jp.add(j2);
               jp.add(t2);
               jp.add(b1);
               jp.add(b2);
               jf.add(jp);
               jf.setSize(300, 430);
               jf.setLocation(700, 300);
               jf.setVisible(true);   
    //           jf.getLayeredPane().add(j3,new Integer(Integer.MIN_VALUE));//把标签放在第二层j3上
    //           jp.setOpaque(false);/*把内容面板设置为透明,这样整个框架的背景就不再是内容面板的背景色,而是第二层中标签的图像。*/ 
               jp.add(j3);
               jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               Listen l=new Listen();
               b1.addActionListener(l);
               b2.addActionListener(l);//按钮登录，退出共享绑定事件监控器
              
    	}
    }

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[70]: /images/20220519/6f53696fc6704bab9dc8ea1b8a05fd9c.png